Lindsay Lohan is set to bare all for an upcoming Vanity Fair cover. The 19-year-old Mean Girls star, who has been the subject of weight loss shock stories in the US media for the past year, is keen to show off her healthy figure - and she has chosen to get naked for the style magazine. According to America's In Touch magazine, Lohan shot the top secret cover photo on a beach in Malibu, California last week - and it was actually her idea to pose naked. A source says, "It was Paris Hilton's recent Vanity Fair cover, where she's topless and covering her breasts with her arms, that inspired Lindsay to push the envelope even further." In some of the Vanity Fair photos, Lindsay mimics her idol, Marilyn Monroe.